IF it breaks you fix it, nobody is stopping you from buying replacement parts or aftermarket upgrades to it if you can justify the costs,
You just cant replace the serialized components (eg: lower for Glocks, FCO for P320s etc)
Almost all stores I know still carry parts for them, just not in previous abundant quantities as before due to low demand.
IIRC, you can still purchase ITAR exempt components directly from the states if needed too, just pay duties, or have someone like IRUNGUNS import them for you