Not really disagreeing with the need . . . but I bet if you also look back a lot of people seem to have got in b/c of Crescent Hawk's Inception, Mechwarrior 2/Mercs/GBL, and Mechwarrior4. Not sure why 3 is never really cited since it was the last one that had BT style modification or the MechCommander games- those seem to have been played by folks who were already following the franchise.
For me there have not been as many compelling PC Game titles as I remember in my high school & twenties- Mechwarrior 3, MechCommander, Privateer, Masters of Orion (2 or 3?), Wing Commander Prophecy, X-Wing Gold, TIE Fighter, Rebellion, Total War, Outpost, Freespace, Tachyon, Freelancer, and others. I was big into the strategic 4X & flight sim titles, but they seem gone.
Unfortunately I have not seen many people come here from MWO though that might be they just stay on that set of forums to discuss BT products.
I am hoping the HBS game brings in the flood, and yes at that time we will want starter material- fiction, rules and sets- to point those people towards. I think those things are coming online which is a good sign.