I think that the rules will be relaxed. The politicians want that, and in aggregate so do the public. Whether it's the right or wrong thing to do, the Central Bank will cave in.
I believe that they should be relaxed. 90% LTV was fine for years. Saving 20% is just too onerous in a world where people are paying a fortune towards rent and childcare.
And the current rules are strengthening inequality, because it's getting to the stage where only a certain profile of person can afford to buy in urban areas (e.g. wealthy parents for their kids, returning "immigrants", senior professionals).