If devs decided to make this change, miners and nodes would then have the option to follow or not, essentially what you are suggesting would be a fork/ hard fork, saying it ain't so ^^ is semantics.
You can test your theory, create a hard fork of BTC now, increase the limit to 42 million and convince all of the nodes and miners to follow you.
I will give you my vote now.
NO
Its not a theory. Its there in the code....
May be you could show us the code? Find the line that says there will be 21 million. The code is on the net. Please give the link to the file and the line number. Thank you.
https://github.com/bitcoin/bitcoin/search?utf8=%E2%9C%93&q=21000000Nice

What the fuck are you looking for?? Thats not the code that defines the cap. Jesus, you guys are truly clueless about all this, arent you?