So the age is going to get risen to 19, then the Tories are going to lose the next election (basically the only reason to have the election at this point is to find out by how much they're going to lose so we know how much to laugh at them), and then the law stops getting updated because it's a dumb and badly written, and then Labour don't implement it any more.

If anything they will probably just rewrite the law to the above version.