How much will the business analysis job grow in the future? will it merge with any other profession? or will it stand alone?

by the reason of similar perfect competition in the future world business , it will grow very much & will be alone because it is very proficienal & active.

Hello the business analysis profession is growing.  Go to www.iiba.org International association for the practice of business analysis.

Yes true, you can check the role details with IIBA-International Institute of Business Analysis.
There is a great future for the Business Analysis profession