Yes, Column repeat layouts are going to be officially deprecated soon. Though it has been marked as legacy and could be withdrawn anytime.
From Pega 7.x going forward, we have more feasible and optimized layout which are responsive across platforms.
Alternatively, please use Repeating Dynamic layout with layout format as inline. It has enhanced support for HTML 5 and CSS 3 structure. DOM created is light and have "DIV" structure instead, earlier used the table format.
Hope it answers your query, kindly notify if it does by marking this post as answered.