If you are talking about who would take him today, that's not really a fair question because Dak wasn't available when teams were looking at free agents and deciding on whether to draft a QB. But had he been a free agent after last season I think the Broncos would much rather have signed Dak than use up a lot of resources by signing an aging and diminishing Flacco and also having to draft Lock in the second round as insurance and for the future. I think the Skins might have considered Dak over drafting Haskins, thereby diminishing the Cowboys chances at the same time. I think Jacksonville would have looked hard at taking Dak over Foles. The Titans are clearly not sold on Mariota or they wouldn't have brought in Tannehill, and I believe they would much rather have had Dak.
As for next season, when Dak will be a free agent if not signed or franchised, there are of course, unknown variables, such as what kind of season Dak will have and what may happen that we don't yet know about (injuries, player declines etc) that would open more opportunities across the league, but here are some possible opportunities just from what we know now ... Tampa Bay is clearly not thrilled with Winston, and his contract will be up. Andy Dalton will be on a team option year, and the Bengals could easily want to go another direction rather than sticking with a 32 year old QB and with what hasn't worked. Cam Newton will also be on an option year, and Carolina drafted a 3rd round QB hoping he might develop, but Dak would be more of a sure thing. Josh Allen stunk it up for Buffalo last year, so if he has a similar year this year Dak would be an option.