Only time will tell, but like you say Thomson seem to be making a push on this destination for W11/12, maybe this is due to the recent trouble in Tunisia and Eygpt trying to persude holidaymakers to try somewhere different!
Aye I have to agree with you there. But I also think that Thomson have launched this route for winter 11/12 as the company behind The Gambia Experience and The Cape Verde experience struggled to find an airline to replace the defunct Hamburg International which was meant to operate this service for this current winter season and could not find a replacement service, so did not operate at all this year.
Maybe the Cape Verde and Gambia Experience will use some of the TOM 757 space to help fill it up and make the destination viable?