humble question from a foreigner: is the SNP going the way of Sinn Féin?

I've been watching the Brits at it for a while and MP after MP from the SNP Westminster branch have announced they are not running in the next GE. Combining that with the bizarre and hypocritical treatment they're receiving from Operation Branchform and the press, is it fair to expect them to stop even bothering with showing up on Westminster in the future like Sinn Féin does?

Given they have no power to do more than complain in Westminster anyways, this might be a course for escalation in the ever-growing "Mandate for Independence" the Tories (Blue and Red) like handing to them.