Abolishing the Senate would require more than a mere amendment. It would require a new Constitution. Article V (which sets the rules for amendments) states that the state’s cannot be deprived of their equal representation in the Senate. Of course a new constitution could get rid of all kinds of problems like term limits for beloved presidents and that pesky 2nd amendment.
Vote Trump!
One can amend Article V to allow states to be so deprived and then amend Article I as appropriate to abolish the Senate. An idiotic idea, but possible without requiring a new constitution.