I`m hitting at least 10-15 segments on United a year. So that would not be a problem
The thing that draws me to UA is that I actually get "rewarded" for hitting between 70 and 100 Segments a year.
All my European Flights tend to Brussels Airways, Lufthansa and Swiss on flight classes that seem to be accruing both PQM and PQS with United (at least according to their website).