The moment Safari stops being required on iOS nothing will change at all, because very few users will run to install chrome. Safari would still come pre-install

The moment Safari stops being required on iOS nothing will change at all, because very few users will run to install chrome. Safari would still come pre-installed and used by default. However, it would probably develop faster. As for 'over group' - no, with the crucial advantage of Chrome bundled with Android and Google gone, other players will pick up quickly, competing for those lucrative deals with the search engines. Currently this space is dead because nobody dares competing with Alphabet.