Across Merlin as a company we do... It seems like a lazy theme to keep pulling out. Yes, it would be nice for FV to have a consistent theme that links Air. However, it is VERY important that the ride fits the theme.
For something related to alien attack or war the ride needs to be packing a punch to make it work. Gently floating around in a flying position just wouldn't fit a theme around death and destruction.
Look at blade? thats not really thrilling at all, yet looks awesome because of the paint job its received to fit in with forbidden valley.
As a rollercoaster, air is considered not as thrilling, but i don't think that should be considered when it comes to theming an attraction, especially re-theming. i think all it could do with is a few near miss themed elements (rocks/debris etc)
in general, i can see a whole re-theme happening more than the tunnel solely getting something anyway. that way the park has something to advertise a lot better than something in air's tunnel.