I think It's simply this: when the G1 was king of the hill, anybody who hadn't upgraded yet wanted the newest G1 styles to play on their older board. Now that the G2 is king of the hill? You can bet we'll get conversions down to Genos (which is already starting) and then trickle down to older models.
There was no point converting Genos to Genos, and as Genos has had a 6 year life cycle, and it was the TOTLA, there hasn't been anything to convert down to Genos. Until now...
Well from Yamaha anyway; there are Medeli, Pa5x and Ketron styles, but the amount of work to properly convert those to Yamaha style format is daunting.
Mark