Were Brent to come to me and say, "Bosch, I want you to redo the Technical Readout line," here's what it would look like. All would be 194 pages total, with 92 different 'Mech entries each; no other units would be included in the print volumes.
One major change I'd make right off the bat is to change the stat blocks. Right now the game stats are basically a design spreadsheet, but players don't really need to see the mass of components, and some critical information is missing. I'd replace it with what players need to fill out record sheets: where each item is, and how many spaces it takes up. With that change alone, the need for record sheet volumes is dramatically reduced, freeing up company resources to focus on actually-profitable areas. The in-universe state block would slightly change to list how many tons of ammo is included with each weapon, and OmniMechs would have their Prime loadout listed here along with their available pod tonnage.
Print Books (also in PDF)
Technical Readout: Succession Wars: Revise the entries to the new stat standard, above.
Technical Readout: Clan Invasion: Would contain the rest of the Classic redesigns in their 3050 configs, the 16 original Clan OmniMechs, the new 'Mech designs from Technical Readout 3050 Upgrade, then fill out the remaining pages with a selection of 'Mechs from 3055U and 3058U.
Technical Readout: Civil War: Would contain 92 'Mechs from 3055U, 3058U, 3060, and 3067.
Technical Readout: Jihad: Would contain 92 'Mechs from 3067, 3075, and 3085.
Technical Readout: Dark Age: Would contain 92 'Mechs from Prototypes, 3145, and 3150.
So the in-print and in-stores line would be just five books, 194 pages each, and far easier to keep in print. The new names and 'Mech-only contents would make it far simpler for non-fanatic customers (i.e., not us) to figure out what books they want and keep the focus of the game on the giant robots.
PDF-Only Books (hopefully print on demand, too)
Technical Readout: <era> Supplemental(s): A series of books that include any 'Mechs cut from the old Technical Readouts. Varied lengths, one for each era.
Technical Readout: <other unit type>: A series of books, each collecting a different non-'Mech unit: fighters, WarShips, infantry and battle armor, etc. If any end up excessively long, they'll be split into two volumes in whatever fashion seems convenient.
Technical Readout: Experimental <unit type>: Omnibus editions of the XTRO series, one each for 'Mechs, fighters, and vehicles. Perhaps expanded with new material.
One key feature of the line would be that units that were previously only published in sourcebooks would be given full Technical Readout entries. Most art would be recycled, but some units would have new art produced, such as the remaining Classics, the original Clan and Inner Sphere OmniMechs, and anything that just doesn't seem cool anymore.
Moving forward, I'd push for strict limits on new designs. Let's say the Powers That Be decide to go ahead and do a time jump to 3250. I'd want to limit Technical Readout: Darker Age's totally-new designs to 20-30 maximum, with the rest of the book showing older machines - especially those only found in the Supplementals - with modern upgrades. This allows players to immediately use their miniature collections with the new stats and doesn't overwhelm IWM; with a little lead time (heh), they might even have most or all of the new miniatures ready to release alongside the Technical Readout.
The main challenge would be where to put unit variants. Personally, I'd be okay leaving them in legacy materials, but perhaps the Supplementals could include the new stat blocks for the gazillions of different Marauders. One idea that strikes me is to change the Tech Readouts to portrait format, allowing home printers to more-easily assemble loose leaf binder collections.
Okay, that ran MUCH longer than I anticipated. Sorry.