Can You Raise The Gamertag Character Limit to 16 or more?

Gamertag character limit is & always has been 15 letters which is plenty.

Highly doubt it'll be increased any time soon i'm afraid.

for Xbox Gamertags can only be made up of letters and numbers. the Gamertag limit can only be 16 characters long.

The old limit was 15 characters so your old gamertag couldn't of been 16 characters long.

You might still be able to change to a tag with more than 12 characters if you do it on a xbox 360 console unless they've fixed that workaround but other than that then you will have to stick with the 12 character limit.

It’s because gamertags now get 4 digits after them if they are not unique (thus 12+4 equalling the existing 16 character limit).

It is a shame you can no longer make a unique 13-16 character gamertag, but I can understand it would over-complicate the system (choose a taken 11 char GT and you can have it with numbers, but choose a taken 16 char GT and it will tell you you cannot have
it at all! It’s difficult to explain this in simple terms on the gamertag selection screen, and so much easier for a simple 12 character limit whether unique or not. We’ll just add 4 numbers to the end if it is taken).

The 12 character cap is to keep the full limit with the suffix to 15-16 characters.

Why do gamertags only support 12 characters now?

We require at least 3 characters to auto-assign you a suffix and make sure that everybody has an equal chance to have a name they can be proud of. Many older games allowed 16 characters for displaying gamertags.
We’re reserving three of those characters for the suffix and one for the # symbol, leaving 12 characters for gamertags.