It's still pretty early on, and these games take time. This is why we're mostly seeing ports and remasters at the moment - they're quicker to churn out, and like the Wii, these devs were caught off guard by the console's success, and hell, it probably took a year or more just to convince many to even START developing for the Switch after the sales didn't drop off a cliff like they expected, which means Q2 of this year at the EARLIEST, just for BEGINNING development.
So it'll probably won't be until late '19-'20 when we start seeing announcements for new major AAA stuff built for the platform. Remember, the vast majority of these developers probably assumed this console was going to be a massive flop, and games these days can take 3-5 years to develop with the monstrous projects they've ballooned into. Still, even when devs start jumping on board, I don't think Nintendo will ever get the support the other consoles get simply because it's just tough for these companies to compete with Nintendo (or at least many devs have that perception that fans of the console will opt for Nintendo games over theirs). This may sound arrogant as a Nintendo fan, but I really think there's truth to it.
"We hold these truths to be self-evident - all men and women created by the, go-you know.. you know the thing!" - Joe Biden