That would be a net positive as we would all benefit from new players that would emerge and fill that void. Obviously your question was rhetorical and this won't happen.
New players emerging in the high-end smartphone space? You seriously believe that a comparable player to *Apple* is going to emerge any time in the next decade? Lol
Normally, no. But in the hypothetical situation of Apple leaving the EU up for grabs for new players, maybe.