Well food for thought there Noelcampbell.
I have seen DG perform a few times as a solo and I could sit and watch a full night of just the man. However, I think that with some of the performance seen on recent tours with the exceptional talents of the new band there are some songs which have "added value" using a term I hear at work 
Listening to DG performing Song to the Siren at the TCT concert at the Royal Albert Hall in March was probably my most amazing moment for a DG song. Doing that as a solo was the perfect situation. When he starts of the night with shine is also a perfect DG solo moment.
But when I hear my fav PFM with DG and all the band rocking away and can feel the buildings foundations shaking I am glad that the band are there as well. This goes for the whole show as well.
Going solo may be something that DG would toy with as he said going back to basics on the Bare Bones with Rob and Neill was what he felt like doing at that time.
One thing is for sure - DG will always do what he thinks is right for his music - if this means going solo then I am sure it will be right for him if he thinks so - and i will be there.
But after seeing him appear to be enjoying himself so much with the band on the last few tours, even if he does some solo stuff, then working with the band will be part of his vision as well.
I think that having the mix of accoustic then full band was good - but as DG comes up with more and more songs then it is going to be harder for him to decide what he wants to play.
He may feel that a solo tour with alternate full band tours is what he wants to do. If he thinks of doing an acoustic album then he may think that a solo tour would be best to promote it. But if he comes out with a full band album them then having the band with him may be required.
Phew what a thought to go to bed with - I will not sleep now - but I will have to try so
Interesting thought though - thanks for raising it - but i do not want to be responsible for the band's P45's lol
Nighty night Noelc

Keep smiling - It's free!
Djk
:-)