At some point we'll reach saturation of what we're comfortable putting into LEO, or at least greater pushback from governments leading to regulations in hopes of avoiding that. There's a lot of space junk out there already and they're still pumping out those isp satellites en mass.

Luckily these specific spacex LEO sats decay pretty rapidly (unless they've made them more advanced recently, I haven't followed closely as of late.) So I guess they'll keep themselves busy at least refreshing the fleet.