It depends entirely on what type of records they have in mind, which in this case is explicitly framed as "records of the past installments," and setting a new one. I think it's very possible given the 3DS performance in Japan, if sales and install base are any indication. MH3G, a G expansion that didn't have the benefit of transferring saves for instance, went to beat multiple projections including Capcom's very own.
Whether the series should go multiplatform or not is another discussion that has been done to death since the announcement of MH4, so I'd rather not go there. But if we're strictly looking historically at what the series can do on one platform, I personally think all the requirements for a very successful MH installment that beats the PSP's last entry are in place, and can be reproduced and surpassed.