How are you getting your teams to actually use HubSpot

The long and short of this is we are moving from Salesforce and Pardot to unifying our processes within HubSpot.

The sales team is made up of some old schoolers who already don't upload their notes into Salesforce regularly, and some young bloods that are pretty savvy in Salesforce .

The marketing team is using Pardot, but they have actively requested we evaluate HubSpot because they just don't feel like it's capable of handling the initiatives we have set for the next 2-3 years.

We are in discussions to sign for Marketing Hub and Sales Hub at either starter or professional tier.

My fear is we have done all these calls and will end up not getting all that shiny ROI because company-wide adoption will fail. Thoughts? Experiences? Help..?