cyphersuit
"I don't think it should be a question of "how much work it is" but rather
"Do we want to see our customers to see X1 as the best DAW on the market?" If so, VST3 support should be there."
Somewhat subjective... Pro Tools, Digital Performer, Logic : none of these highly regarded DAW natively supports VST. They either have their own standard and/or support the open standard.
Admittedly, there's a problem with the lack of an open standard on the PC platform since the demise of DX though. Which means that the implementation VST3 seems bound to happen sooner or later.