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The question of whether FTL is plausible pretty much sorts out the rest. Nothing in the universe has ever been known to exceed the speed of light, so asserting that finding alien life is 100000X more likely than many things is pretty absurd for several reasons, not the least of which is the implausibility of travel many times faster than the speed of light and the ability to generate the infinite energy required to do it.
According to the theory of special relativity you need infinite energy, however there are instances of FTL particles like Tachyons. Even if you don't travel at light speed you can still traverse within your own galaxy, we're a tiny tiny tiny spec in our galaxy, it would certainly be justified to assume that within our galaxy is alien life. Intelligent alien life? Maybe not, but alien life in general? Sure.
This thread talks only about aliens, plants can be aliens, insects, etc. If we get in to the realm of intelligent alien life then the chances probably go down drastically, but are still high in something so huge as our galaxy.
As for the 100000X quote fine, on a technicality you ish got me there! I'll change it to: Likely