I personally think that regardless of your entry level (320 or 72) when upgrade time comes it all boils down to 'stick performance' in the sim evaluation. And by this comes with experience and level of competence. From entry level till 2.5 to 3 years is a lot of time to develop and gain proficiency. ANY initial type-rating does not outright mean that you are type specific 100% proficient. This simply implies that one is 'trainable' and 'can-well adapt' to type specific equipment. I am very hopeful that every 320 or 72 wannabe and/or newbie will do just fine down the line.
