I really don't think there's much difference between x-trans 1 and x-trans 2 except for a slight repositioning of their pixel arrangements and AF detection. I've been to their product seminar and briefings and when I posed to them this question, there's always this squint with a very generic answer that implies very little has changed.
Also, film simulation does not happen on the sensor. The sensor outputs raw files which then get converted to jpeg, simulated. So, it is software algorithm which is applied to the files. If anything it happens in the processing engines. Fujifilm knows colors very well. If they wanted to, they can easily do it. They same guy who was in charge of their film formulation is in charge of their digital color formulation currently.
When probed further, the Japanese chief engineers will always say, "ummmm...maybe later, not so soon". But they never said no or that it could not be done on x-trans 1.
That's the thing, if "the future of LEICAs is in Fujifilm's X System" then Fujifilm shouldn't jump into the 3 year obsolete regime that's killing so many other camera companies.....killing themselves that is.