This is a user to user forum. You aren't talking to Adobe staff people here generally. Signing up for any Adobe plan is usually a one-year commitment. Whether or not you would be able to switch to a different plan within the year is something you would have to discuss with an Adobe representative.
Thank you for the response, Jim. I'm actually aware this is a user forum. I asked the question here because there might be people similarly situated who have ideas or experience dealing with this new licensing and cloud storage situation, or who would benefit from the answers I receive.
Obviously not. Sorry to have bothered you.
You weren't a bother. Many people come here thinking they are addressing Adobe directly. I'm glad you understand differently. I was merely pointing out that accepting any of the Adobe plans is normally a full year commitment with penalties for early cancellation. You would have to talk to someone from Adobe to find out what the possibility would be to switch plans in the middle of the year. The alternative would be to simply continue with one plan until the end of the first year. If, at the end of that year, you are satisfied that you no longer need Lightroom Classic CC you could easily switch to the other plan which would give you the 1 TB of cloud storage that you are seeking. Same price, more storage, you drop the program you don't need. Only question is whether or not the 20 GB of cloud storage would suffice for that first year.