Airliners DO get grounded after an incident involving another of same type
Groundloop: As has been pointed out, any responsible airline would certainly ground all of the same type involved until the cause is properly discerned, and permanently fixed, and measures taken to prevent a recurrence.
This virtually NEVER happens. Only in VERY extreme cases - eg. Concorde after Paris, DC-10 after Chicago (and then only in the US).
If is happened after every incident popular aircraft like the 737 and A320 would not fly very often!