I have been on Remicade for 3 years. It’s improved my Pouch inflammation considerably. I have not had any side effects from Remicade nor have I shown any signs of being immunosuppressed, although I had a cold in October 2017 which was the worst cold I ever had in terms of intensity of symptoms and also lingering for around 3-4 weeks. That was seemingly an aberration as I really haven’t been sick before or since, although I don’t have kids that might expose me to various microorganisms.
If you are 33 years old I wouldn’t be too worried about getting immunosuppressed. Like a lot of posters on here you have pre-judged the situation, possibly to your detriment. You don’t know how it will be on biological drugs until you are on them. Many people do VERY well on them with little or no issues.