"All right, but apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, the fresh-water system, and public health, what have the Romans ever done for us?!"
Was there any widespread increase in standard of living that an area might experience after being taken under Roman control?
The Monty Python scene that presumably prompted your question was carefully analyzed here.
I'm not sure if the moderators will allow links to /r/badhistory, however /u/Tiako is a flaired user in /r/askhistorians and frequently contributes to the subreddit.
Alternative question: how large would the Roman Empire need to be spread before it loses the ability to provide said living improvements?