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That simple if Verizon will allow you to do it. However 'Dry Loop' is not a tariffed service, so like DSL, Verizon has no legal obligation to offer it, and in some markets, Verizon does not offer 'Dry Loop' Service.
So while there is no harm in asking if you can have 'Dry Loop' service, there is no guarantee that it is available in your market. In most markets where 'Dry Loop' is offered, your DSL service is about $5 per month more without a landline.
That $5 is still considerably less than the total montly cost of landline service, which is typically about $20/month with the various fees, taxes etc added on.