Actually, I'd like to see better methods of processing/digesting email, but not for personal email.
My work email is flooded with all kinds of junk, and I wouldn't mind someone trying to improve that. I get a bunch of ads that I wouldn't necessarily call "spam", but their ads. I actually want to get some of them (they're sometimes relevant to my job), but it's always super-low priority. I also get copied on a bunch of stuff that I might want to look at, often don't really need to, but that I do want to keep a record of the exchange in my email.
I also get automated notifications for certain kinds of things which could stand to have automated intelligent processing. For example, I might have an automated alert set to email me when a server isn't responding to a ping, and I *do* want to see that. However, if the server's internet connection goes flaky overnight, I might end up with 80 messages saying, "Error: server.domain.com is offline", and then a little while later, "Recovery: server.domain.com is online". It'd be nice to have all of those rolled up into a email digest that says, "You received a flood of messages with similar subjects. Here is a list of them, in order." I don't know practically how you'd do that, but I wouldn't mind if someone were to figure that out. Considering how much spam still gets through my spam filters, I don't expect a solution anytime soon.
Anyway, my only point here is that there are improvements that could be made.