"It's an obsession with backwards compatibility because some people have spent tens of thousands of dollars on stuff for this program (as well as Studio, for that matter), including probably your own merchandise." 

So those who spent "thousands of dollars" on Eight track Cassette  tapes,Vinyl records or who bought the $50,000 version of "Alias Wavefront Maya for Windows NT should have not been forced to ever spend any more money by the uni-directional nature of the space/time continuim?

Time has a very predictable effect on software&technology.

Why should poser consumers be insulated while other real world consumers are routinely forced to accept that"oh!..they dont make/support product/feature x anymore".

" You wanna be the one to tell them their stuff does'nt work anymore? Be my guest. Suggestion: keep your asbestos suit handy. You're gonna need it."

Uhhmm... no... my "Animated pose sets" for V4 are in PZ2.. a poser native format.
when the Day comes that the old beloved PZ2 is no longer supported by poser/Daz. 

Then burden falls upon me.. THE COMMERCIAL PRODUCER to switch to whatever the new standard may become for saving figure animation Data.

..or remain cowering in the crumbling caves of the past blathering on about "backward compatibility "while other character animators erase my vestigial products from the market with the new standard...

This is not rocket science.

Where is that "Thank you" or "Like" button, when you need it most?