If RVP leaves, someone else will step up. In Wenger's system, there's always a player that ends up being the sharp point that finishes off attacking moves started by the team. More than a decade ago, it started with Anelka -- a teenager from Paris who became top scorer. He left, and Wenger signed a certain winger by the name of Thierry Henry. There were a few articles I remember (one by Ian Wright himself) basically calling Wenger stupid for trying to convert Henry into a striker. Henry went 8 or so games without scoring a single goal, but when it happened, the floodgates opened.
And when Henry left in 2007, everyone wondered where the goals would come from. Replacing him was an inexperienced Togolese striker called Adebayor, who had only ever scored a handful of goals... He ended up scoring 30. When Adebayor left, the goals had to come from midfield because our main striker (RVP) was injured 24/7. The season he wasn't, you saw what happened.
If he leaves, someone else will step up. Someone always steps up.