Its not as simple as increasing MP. Lenses have to keep pace to realise the potential of high MP cameras as it was Canon listed ideal lenses for the 5DS / 5DSr as not all canon optics had the ability to provide the right resolving power. As EF development has been suspended that task falls to the RF mount but not all high end photographers want mirrorless cameras so the sensor development needs to be transferable between both DSLRs & Mirrorless.If the R5 has 45MP why would it be a replacement for 5DS? A 5DS successor should have far higher MP (the rumored 75MP or 83MP).
Having used the 5DS since it launched for my type of photography (which is not birding) 50MP is more than enough and in portraits I find if I remain at 50MP I use low contrast filters to blow highlights to break the harshness of such clinically sharp shots. 45MP is to me a "sweet spot" providing details most lenses can deal with whilst not producing file sizes that after post-processing quickly eat-up storage space.
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