I don’t agree that the SSPX is really a “disturbing factor”. The great majority of laity would have no idea what SSPX is. Pastors are losing some sheep to non denominational churches, and more sheep to secularism, but not to the local chapel. It may as well be in the next diocese, for all the impact it has. It “disturbs” nothing.
I see it as a lost opportunity. There are enough people locally supporting a diocesan TLM, with rotating priests. The community is something like a parish, but there is no full time dedicated priest.
This diocesan TLM community supports solid doctrine and family strengths, and opposes liberal trends, as the SSPX presumably does. But unlike the SSPX, the community also (selectively) supports and directly participates in solid things going on locally, prolife and other things.
The diocesan community affects the region; the SSPX chapel seems to be almost hermetically sealed off.