My 2 cents.
It'll come down to coaching. Laporte is on his way out. Last year in his contract. Coaching part-time now since start of season as he is in the running for the FFr presidency election. Waste of his time IMO
New coach Dominguez will take over at some stage. Don't know how he will fare. With the new staff Toulon could either go to pot, or be brilliant IF the outstanding individuals are well coached into a cohesive team unit which they were under Laporte hence their success. Their depth is just ridiculous. They have 2 international teams. No other side in T14 has that kind of depth.
As a toulousain. I hope they go to pot in the league and focus on Europe. Old rivalry...
Having said that will also enjoy their demolition of other european sides in the CCup. If they click in Europe, with the many game breakers they have in the side, it'll be ugly for some of visiting teams...
T14 is slighty different as they don't field their best side every weekend.
We beat their 1st team twice last year home and away - they have a lousy record against us. But we had to hit some of our best rugby to put them away, which we couldn't replicate all year.
Toulon will probably go for the double (T14+CCup). Toulouse will focus on the league only. We are blooding too many youngsters to chase the double + our new staff (head coach and DOR), so double no longer our ambition. Our focus is different. We have 11 U25 players in our side, most from the academy. The new staff want to blood them. This takes time. Toulon don't have that problem.