Tried to read all through the thread here and didn't notice if anyone mentioned price, but I think that was a big factor.
It was costly to build Rogers drums and that was significant, particularly for the Brits at the outset of the Invasion. So they probably got used to that Ludwig sound, it was in their recordings and they kept going with that sound. They did, as someone noted, convert their hardware to swivomatic. Baker, Mitchell and Starr all used the swivomatic mounts and I think Baker and Mitchell even used the spurs.
Rogers was continuously investing and improving. That kind of development is expensive because you have to keep buying machines or paying outside vendors to produce the pieces for you. Ludwig and Slingerland were in-house businesses. Slingerland even had a chrome shop in their factory. Look at the shells of a Rogers drum too. Nobody is building a better shell to this day.
They are night and day from the relatively cheezy shells of the Ludwigs, which Ludwig could build in their own shop.
So it was, in part, the costs that reduced sales and eventually revealed business decisions that were less savy than those of the Ludwig folks who ultimately triumphed over them all and are still building drums to this day.
Now Gretsch was the company that pursued endorsements with jazzers and they almost got wiped out in the rock era. In fact, I think they did get wiped out, but Fred the grandson brought them back strong again with some currently really good choices. You need $$ again, so they may run into the same issue as Rogers then. DW could too. On the other hand, we generally all have more money now than people did back in the '60's. That is why you have so darned many vintage kits in your houses! So it's hard to say if the same outcomes will appear.
By the way, Rogers drums could be purchased from Sam Ash on Long Island in 1967 for 40% off. I have a sales receipt from a one owner kit that reveals this. 22,13,16 with Dynasonic in blue onyx for $345! How cool was that. But Rogers was probably bailing the stock so they could get out of Ohio and on to CBS in CA.