thinking of going tailor/enchant to herb/alch

Personally, i think the market for alch isn't worth the effort anymore, Easy gold making is enchant/herb, but if your going for synergy go ahead.

Herb, even with the BoS into crap vendor, are still a great money maker.

If your doing this for money i'd highly suggest going into r/woweconomy for some tips and hints

I am tailor/enchant and it is very decent passive income. Every WQ that doesn't upgrade gear is 350g instead of 40 vendor price. Also I do any WQ with 3+ blood of sarg and use those for the low material capes. 400-500g in mats then aell the capes for 2-5k on AH. I can make/sell about 15 per week.

If you want to grind out gold for hours they are not the right professions of course. However, if you have limited time and want to focus on other things while still earning gold; tailor/enchant are pretty good for that.