Do you mean from the top level or bottom level.
At the bottom level – meaning you as a customer, yes it will stop as eventually the bookie will ban you from promotions.
At the top level – meaning the regulators / government, who knows? people are constantly lobbying against bookies for the sake of 0.5% of the population who are problem gamblers. It is completely feasible that the government / UKGC could ban all promotions at somepoint in the future, but for now just take advantage while you can.