Blob transactions

I’m a layman with no tech background and trying to understand the blob transactions format post. 1. Does that mean we would have two transactions format until sharding comes in? Blob transaction for rollups and existing for L1 transactions or blob format for both? 2. Also, the post says network nodes will delete the blob content after 30 days from the time it gets added to the block. 3. Won’t blob transactions further push the rollup launches as they have to upgrade on how they process the data?