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I would check for crown or root galls. Here is some information on them that may be helpful: https://www.gardeningknowhow.com/plant-problems/disease/how-to-fix-crown-gall.htm

If that doesn't turn up anything, it may have a fungus. Treat the plant with a fungicide. I like neem oil, as it will also deal with any pest issues the plant has and it is safe for people and pets. Here is more information on it: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm

This article should help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm

These are fast growing vines, so it shouldn't take too long depending on the type of plant used (i.e. cutting, seedling, larger potted plant). Anyhow, it is difficult to say for certain how long it will take to cover the pergola fully but at least within the first two years or so with good care. Blooms, again, depend on the planting used but once flowering occurs in mid-spring, should last a few weeks. Phosphorus rich fertilizer or bone meal added to the soil around your plant will help with blooming. Here is more information: https://www.gardeningknowhow.com/ornamental/vines/wisteria/growing-wisteria-proper-wisteria-vine-care.htm

These are fast growing vines, so it shouldn't take too long depending on the type of plant used (i.e. cutting, seedling, larger potted plant). Anyhow, it is difficult to say for certain how long it will take to cover the pergola fully but at least within the first two years or so with good care. Blooms, again, depend on the planting used but once flowering occurs in mid-spring, should last a few weeks. Phosphorus rich fertilizer or bone meal added to the soil around your plant will help with blooming. Here is more information: https://www.gardeningknowhow.com/ornamental/vines/wisteria/growing-wisteria-proper-wisteria-vine-care.htm

Some of the roots will continue to sprout even once the stump is removed. This article will help with eliminating wisteria: https://www.gardeningknowhow.com/ornamental/vines/wisteria/controlling-or-getting-rid-of-wisteria.htm

For the wisteria - there is a general rule of thumb about wisteria and this is that the first year they establish, the second year they relax and the third year, they take over. Give it another year and you should see healthy and active growth. As for the yellowing, increase the water some and give it some balanced fertilizer and that should help.

For your grapes - You may need to do selective thinning. This article is on seedless grapes, but the advice still applies to your Concords: http://aces.nmsu.edu/pubs/_h/H-311.pdf

For the honeysuckle - Yes, you can. This article will help with that: https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-root-cuttings-from-various-shrubs-bushes-and-trees.htm