“consevatives to driving car to shul on Shabbos”
I have never been to a service at the one C shul in my neighborhood but it does look like almost everyone who attends services there walks.
“reform expanding “
In my neighborhood the two R shuls have small memberships; one seems to be kept afloat only by Orthodox folks renting space there for minyans and simchas.
“just do whats comfortable to you”
That is not what Orthodox Judaism is about and you know it.