I really hope that isn't the strategy. One of the best things about Battletech is that it has all these other units. If the strategy really to abandon everything but mechs it makes me fear for the future of Battletech.
Abandonment isn't an issue here. One can still buy TO, SO, CO and IO as well as all the TROs and record sheets as PDFs. What CGL seems not interested to do, is to burn money in feeding the older fans the same old rules, fluff and sheets once more.
What they are interested in, how I read it, is giving new players easy access to the core game and its more advance rules in the foreseeable future. And, being honest, I don't see any newbie finding out about and enjoying vees, aero and infantry all by themselves. The material is not at all easily accessible right now. But if a new player gets a grip on the 'Mech rules and then gets into contact with us older players, we are certainly capable to point them into the right direction.
EDIT: grammar, we fight constantly, sorry you had to see the mess.