I'm inclined to agree with you, but my reservations are rooted in human nature, not just corruption in politics, but the tendency in a constituency to become complacent when things are going well. FDR won 4 Presidential elections, and as a result we have the 22nd Amendment. If we thought it good sense to restrict Presidential terms, why not Congressional as well?

Less time in office means less incentive for special interests to surreptitiously woo a public servant's loyalty away from the public. Less time in office would also encourage more Americans to participate in statesmanship.