Is it just Bournemouth? As far as i am aware Thomsonfly have not announced expansion from Coventry or DSA either.
Thomsonfly seem to have been caught up in the ongoing internal reorganisations at TUI (who is in charge of Thomsonfly at the moment anyway?) and focus has moved away from the expansion of loco services back to the traditional charter market. Not sure how sustainable that is in the long run...
In any case, from Bournemouth's point of view I don't think it's all doom and gloom. As you say, loads on Pisa and Paris were OK and presuming that yields were likewise, I'm sure someone else will be interested in the routes.