I think that if a bass is shortened or a bass is made shorter/smaller, it will have less depth in the tone than being 2 or more inches longer. I have and have had basses that were shortened in several ways from neck grafts, block cuts, false nuts and bridge shifts as well as some combinations of 2 or 3 items mentioned. The playability for finger stretch gets easier but often you are pushing the notes lower down away from the player in the upper register making that F# or G octave that much further away to find.
The sound is often more focused if that was a problem to begin with but there is some equal amount of depth loss in the process. The instrument being a bass to begin with is fairly deep anyway considering we are talking about a fairly large instruments over 3/4 or 4/4 even.
Now, from a players stand point, I don't see many people who are working to memorize fingerings for everything they play to avoid mistakes and intonation problems doubling on a bass in 5ths. Playing in 5ths is basically a move to playing a GIANT Cello that from a distance, is called a Bass!
You can play and double on 4-string in 4ths, 4-str. with C-Ext. of any variety or even 5-string bass BUT, with everything tuned in 4ths or occasionally the Low B moved up to C for some passages. Playing in 5ths is a Life change and is no small adjustment on ones mind either.
I can see some small improvements in playing in 5ths and some small numbers moving to it as well but I do not at all see this as a change in how the bass will be played in the future. It took centuries until the world agreed on the main tuning in 4ths with 4 strings and now some think they need to go back to a tuning that helped drive people TO playing in 4ths.
The 3-string bass in France was played in 5ths for extra range 150-200 years ago and then the switch to 4-string gave them that range and more. In most of Europe and partially in the UK, if you need the full Cello/Double Bass range, you play a 5-string bass. In USA, C-Extensions are much more common than 5-Strings but the 5s are out there as well.
Making a bass small enough to play in 5ths comfortably is just making in my opinion, a half sized bass with less bass depth in the sound. Most players I know are looking for more thick bass depth in their sound, not less.
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