Do you know how much the 11 cost for you, in comparison to the T2/17?
I can't comment on the cost myself as I have a pass.
The situation is unchanged this morning with the double deckers terminating at Tesco, Carbis Bay and the TfC website describing the situation with the 17/17A/T2 as 'ongoing'.
There wasn't even a notice in The Malakoff bus station yesterday afternoon about this change and it seems there is an assumption that everyone gets whatever basic information is available, online.
I note whilst there are no RRBs from St. Erth, the St. Erth departure boards show buses to St. Ives, which is basically the 17 timetable and of course, they are not running as far as the The Malakoff in St. Ives. The situation for train travellers will be somewhat alleviate on Monday when the St. Ives to St. Erth branch line reopens, though I appreciate the ongoing bus change is still going to have an effect for many journeys. Hold everything....as I type, there is actually a T2 running between Tesco and The Malakoff.