Meet isn't a type of product that takes effort to migrate from. It's per meeting.
Also, it's part of G Suite that they sell to companies, so it shouldn't be discontinued anytime soon. For free for consumer however, nothing guaranteed.
When I've got a calendar full of meetings and they all have meeting links in them then yes, migrating away is going to be a pain- and that's assuming that they just EOL the product, and don't do what they've traditionally done which is to try and force you into one of their other crappy products. I still remember when every youtuber got forced into Google+. Youtube is per video! How bad could it be! Turns out, pretty bad.
Also, it's part of G Suite that they sell to companies, so it shouldn't be discontinued anytime soon. For free for consumer however, nothing guaranteed.