Now I want to ask you:
Why did you start play the guitar?
Same reason as started drums, sax, flute, wind synth, bass, keyboard, vocals, and computer music apps - to make music in the unique way that particular instrument expresses itself.
Each musical instrument expresses itself in it's own individual way. While they all share the same 12 notes, they each have their individual timbre, note range, polyphony, articulations, and the nuances they are capable of producing. If you want to play guitar expressions you can get most of the way there with a synth, and even do some things a guitar cannot do with the synth, but you can't reproduce 100% of what the guitar can do at this point in technology. Plus, as close as I can come to guitar-ish expression on a synth, it's a lot less work on the guitar because of the ergonomics of the instrument.
Playing different instruments is like playing different musical genres, it allows me to put on different musical 'hats' and express different facets of my personality.What motivates you to keep on playing?
One word: FUN!What would be your vision/ "guitar dream"?
To be a competent as Jeff Beck - but since I started playing in my 60s and I have to share my time with other instruments, I'll have to live a long time for that to happen -- but I'm up to the task if medical science can hold up their end of the bargain
To quote Rachmaninoff, "A lifetime is enough for music, but music is not enough for a lifetime" - there is always something new to learn, a new adventure waits around the corner.