if your current tour makes good sales and the same conversion ratio, why not have a SECOND tour created and use both? but if your current tour really isn't selling well anymore, or doesn't represent your member are enough to where retention is dropping off, a new tour could be the ticket.

make sure you save the old tour just in case. it would be a bummer if the new tour didn't sell as well, and it was lost forever.

there are lots of other reasons for sales to drop off besides the tour, so you won't know for sure if the tour is the problem till you test the new tour with very similar traffic and compare the stats.

good luck!