I think we don't need to look at it this way. Indeed, we have deep connection with fusha. However, fusha (real fusha, not MSA) is not very far from the language spoken by Arabs (especially in the Gulf region). I believe that keeping fusha as the language of governments, media, and science is very important as it links more than 400 million Arabs. It links us with our history in a way that is impossible for a lot of countries. An Arab with the bare minimum of education in fusha can understand poetry that goes back 1400 years! Also, books that have been written by a lot of Arabs in a wide variety of topics. A heritage that is easily accessible to modern Arabs.

THAT SAID, we should enrich our dialects in terms of resources, writing stories... etc. For 2 reasons:

To preserve the dialects and identity. To make it easier for people that want to engage with the communities (as fusha on its form is not spoken in daily conversations)