Warning: Spoiler Alert
I really badly want to know that the guys that were supposedly from the future really were from the future. I know that the way that the writers are going to write things on this show, they're not going to do anything where they're going to go completely into the crazy when it comes to speculative fiction, but ... I want it. It would be so much fun if that's really what was going on, and this whole thing was a giant ball of wibbly-wobbly timey-wimey. It would make my insides all toasty with the happiness of it. No lie.
Also, love the shout out to "Doctor Who," and the fact that it was Esposito that was watching it (and that he was the one who made the shout out) since he's not the one that you would peg as being the DW fan (that is straight up Castle and Ryan right there).
The thing though with saying that Castle is going to start righting "serious literature" and that Beckett is going to become a Senator (and that they're going to have three kids together) is that it could turn into a self-fulfilling prophecy. Since the idea for those things have already been put into their heads, they could start moving toward them as if they were things that they really wanted to do, but in the back of their minds (since they both left the episode with some kind of doubt as to whether or not there was a possibility that either of the dudes were really from the future), they can both have that voice in the back of their minds that tell them that they had little choice in the matter when it came to those things (cuz they were supposed to happen). Temporal paradoxes and all of that. Oh, there's no way that they are going to be able to get away from the fact that if the guys were just crazy, they fully had the choice to do whatever they wanted ... and they still moved right toward what they had been told would happen. This sort of thing makes my brain all happy and cozy, and that is no lie.
Even if Alexis has to liv her own life, and make her own mistakes, I'm really not digging the way things that were left between her and Castle. It felt too much like goodbye forever ... even though it wasn't. Maybe it's just nothing more than the fact that she's in college, and she's wanting (and needing) her own space to grow, but it just seems like she's leaving forever. But part of that may come out of the fact that this episode was all about time and changing things (for better or worse) ... and then, there was the fact that there was a mention of a future family between Castle and Beckett (regardless of whether or not it might happen), and the fact that Beckett even acknowledged the fact that Alexis might be branching out to kind of get away from the both of them (not necessarily as a bad thing, but their relationship can mean that the dynamic of the house changes, even if Castle doesn't stop loving her).