I really see no risk in doing modern 2ts, that will pass legislation. Or ones that may not, such as just pre reed EFI, with regards to MXers. Most solutions are being sat on, and the placing of a 2t in an existing 4t chassis, can be done at minimal expense.
If you , Uniflow, can do a EFI 2t - that is far more sophisticated than just the placement of an 'electronic carburettor', which is so prevalent now, as to be of little expense, it's not much of an ask, for a major manufacturer to put such basic tech (I emphasize the 'electronic carb, that EFI basically is - not your impressive transfer port / case injection efforts) on a 2t.
Frankly, I think the Biggest Risk for manufacturers, is to not make a return, at least partially, to 2 Stroke production. Rotary Debacle? With relation to bikes, Suzuki's RE5, Yamaha's never produced Rotary ( and their never produced, road going inline , pistoned Four cylinder 2t that the TZ 700 /750 were supposed to be 'race versions of, for the F750 class) Van Veen's OCR(?), Hercules / Sachs , Nortons (great track record, for such small operations, in both Race teams) Rotaries, were not debacle, just a branch of motorcycle engines, that was
barely touched on. I know bugger all about the car market, but I don't recall lots of manufacturers, going for Rotaries, and losing their shirts over them?
But, I may have easily missed such a 'debacle' - as I said, I'm not particularly car orientated. Two Wheels have always been my passion - 4 or more, transportation, is all.
It's funny, my little suburb against the mountain, seems to have a bit of a RE(?) 8 cult going - I know of at least 9 of them being nearby
......... I love how my two V8 worshiping / Drag Racing brothers nearly foam at the mouth at the sound ( or even sight) of them!