The One X has the components to be perfect, but it's not overall the best.
No removable battery. If the battery were larger in the One X, this wouldn't be a problem.
Capacitive buttons. Ugh...Why? Google implementing software keys was a godsend. Why would OEMs insist on something Google wants to get away from? Cuz their idiots.
Finally....
Lack of memory. At the minimum, the One X would need 32gb of on device storage for me to be satisfyed. 16 won't cut it.
So, overall, if these changes were made, then yes, the One X would simply perfect.
Buttons: I, for one, don't mind the capacitive buttons on my EVO LTE. I just wish they were a little closer together to make one-handed use just a little bit easier.
Battery: True. That mind-blowing screen also blows through the battery if you're not careful. I think HTC did the right thing putting a bigger battery (2000 mAh vs. 1800 mAh) in the EVO, especially since CDMA can suck battery faster than GSM at times. I really like the trend of batteries becoming bigger. A friend told me that non-removable batteries are often more efficient than their removable counterparts, so I wouldn't care if it's non-removable, just as long as it's big enough.
Memory: The term memory can be ambiguous. Some people use it to mean RAM, and others, like you, use it to mean storage. One of the things that stopped me from wanting the GSM Galaxy Nexus was the lack of storage. If Google and HTC don't want to use microSD, they should at least make 32 GB variants available. 32 GB + microSD (see Galaxy S III) is kind of overkill for most people, but 16 GB + microSD (my EVO) or 32 GB onboard (VZW & Sprint Galaxy Nexus models) is the way to go. If they want to make a cheaper, lower storage option, more power to them, but let us have more storage if we want it.
Additionally, as The Hustleman pointed out, more RAM would be quite welcome, too (might fix the multitasking issues in Sense 4).
Also, I wouldn't mind if the screen was a "contour display." Not sure if that's possible with LCD, but it adds both design flair and ergonomic benefits to the Nexus S and Galaxy Nexus.
Sorry for the book, but I would love to see HTC do an improved One X as a Nexus. Maybe they'll catch Google's eye with this rumored One X+.