I predict it will have good 3rd party support, but though the version of games released on Switch will have the advantage of portability, they will be inferior in every other aspect compared to other platforms.
Only time will tell anyway.
Regarding the current games not coming to the Switch, I am not surprised by that happening now, what happens today regarding 3rd party games releases does not tell me much about the future, let's wait and see what is going on in one year.
On the one hand I think nobody expected high sales number for the Switch a this time of the year, this was supposed to be a soft release, far from holidays or specific dates where sales are much stronger.
Given the good sales I wouldn't be surprised 3rd parties start jumping on the wagon and producing some (more graphically limited) version of their titles, or even original titles. But only time will tell.