The best replacement for bookcases is bookshelves.

The best alternatives to bookcases are rated as following:
★★★★★  bookshelves
★★★  shelves
★★  cabinets
★★  wall units
★  shelving units
  tv stands

Your alternative for bookcases is not listed? Suggest!
Speaking about bookcases, one probably shouldn't forget about fireplace.

Other search terms related to bookcases and their ratings are:
★★★★★ fireplace
You have in mind a companion for bookcases and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of bookcases in all years. Click on graph for more.
bookcases
bookshelves
shelves