According to PW Insider, WWE has a contract with Full Sail University which will keep NXT there on a weekly basis until at least March 2020. As a result, if WWE is indeed planning to take the show on the road now it airs on the USA Network, it won't be for a while yet.
Dave Meltzer has previously claimed that WWE has considered holding NXT TV events in different locations starting next year but, as of right now, they're still advertising tickets for shows in Full Sail.
The reason for this possible change in venues is because All Elite Wrestling is obviously holding shows across the country and there's a belief in WWE that this could be why Dynamite is beating NXT in terms of ratings (it certainly makes their shows feel like a bigger deal).
We'll keep you guys updated as we learn more.