Both Sora and Claris was just revamped and both are still 9 and 8 speed. Maybe next time they will move to 10 and 9 or get new pull ratios like Tiagra 4700 did, but for the foreseeable future Im sure parts will be available. In fact I was looking at a Trek 1.2 and a Giant, both with Sora, and Im not afraid parts resources will dry up. Maybe in rich countries like the US "everybody" rides 11 speed, but Im sure many places have less average disposable income and Im sure Shimano will want to have product available for them (and the budget minded cyclist, like me) as well. One thing i have noticed though is that the best 9 and 10 cassettes tend to all of a sudden only be available in Ultegra. Imo that the biggest knock against the 9 and 10 speed. Then you might as well ride 11 speed 105. Still I believe both current Sora and Tiagra are fine options.