Oh, bless your heart...you sound so distressed...and lots of us have been in the same position. My husband was diagnosed just over a year ago, but I noticed changes before the diagnosis. I joined TP in July...and did what you are doing. I read lots of posts, read about people much worse than my husband...and it upset me...and for a while I didn’t read, or post. Then I had questions, and came here, got them answered...and gradually got to ‘know’ people here. It will be the same for you...this is such a good source of support, and knowledge.
It is good to make plans for the future, but try to slow down a bit. Don’t waste the present, worrying too much about what might happen. It is real, and it is scary, and horrible, and unfair...but you still have your lovely husband. He needs more support now than he did, and you will gradually get used to providing that support.
As for if, or when, the time comes for full time care, you may be able to provide it, with some help, or you may need to use the professionals.
Rather than make hard and fast rules about what I will or will not do in the future, I am thinking I will provide all my husband needs, in our own home...until or unless the time comes when the care can be better provided by someone else.
This is not my first marriage: my late husband wanted to die at home...and I kept him at home for as long as I could. He was ill for nearly five years. And for the last three weeks of his life he was in the hospice. I had not failed him; they could offer far better care than I could....by a million miles. So try not to worry too much about what might be happening in a few years. Make the adjustments you need to now, and enjoy everything you can do together now.