They have being doing this for ages and failing in almost everyone of them.
But seeing some very dumb takes about Forces made me realize most people don't really understand that is just because Sonic never did means that they should. Certains genres and types of gameplay are incompactible with Sonic, like FPS. This type of thinking only makes Sonic series goes deeper in its hole.
I think an issue is that, comparatively, sega is actually a somewhat small publisher these days. Yakuza games and fantasy star are guaranteed hits, so they are getting the bulk of their budget. 3d Sonic games are a little more expensive to produce, and often require the devs to make somewhat big, good looking environments that people just boost right through. I think big 3d sonics are a riskier venture than their current bread and butter, yakuza and fantasy star. I think sega needs to figure out how to make good, cost effective, 3d sonic games and get them out more often.