Until quite recently (when Stream became the default), TV360 has been VM's default option for new customers since several years. Their marketing operation is very much focused on the "upgrade now" & "you need to upgrade" line being pushed at any opportune moment.
The option to upgrade to a V6 should still be available to you if you specifically request, but you should expect to receive a serious sales-pitch for TV360 and may have to be pretty firm if you so desire. All the sales & marketing material will be aimed at TV360 for sure.
TiVo's that are diagnosed faulty are replaced with V6 as a matter of course - although even here, there have been reports of rogue techs going off-script and offering conversions to TV360 to unsuspecting customers.
Does your TiVo have any service faults?