Isn't the biggest issue with this theory that the time lines do not match? Which is why with V'Ger time traveling is often invoked? And from what TNG/VOY told us of the Borg, the time line of the origins just do not match at all
One complaint that I personally have is I feel the Trek universe is shrinking. It's been a while since I watched Trek and felt like the unknown truly exists just beyond that one star. Everything does not have to connect (even if it can be fun to sometimes
do cross overs or have one thing influence the other).
But in this case...it seems pointless.
Is anything added to the Trek mythos by merging the two?