I agree with OP and others, 2020 will most probably be the first year when the most important factors will be favourable for PS5 launch.
About PS4 Pro being less powerful than XBOneX, this doesn't look like it's affecting sales negatively, PS4 as the whole brand still outsells XBOne 2:1 or more, but should it become necessary, a more powerful PS4 Pro 2 could be made to fill the high end in the last PS4 years without rushing PS5.
Launching early to replace a very successful product doesn't look like a sound strategy, the last successor to a market leader that was launched earlier than competitors was Wii U, just to say...







