Are software makers becoming more considerate to left handed people?

No.  If they were, they would have included left handed options from the get-go.  Hey, who cares about 10-15% of the users anyway?

http://www.droid-life.com/2013/11/25/latest-swiftkey-4-3-1-update-brings-new-left-handed-options-and-bug-fixes/

http://www.vg247.com/2013/11/29/killzone-shadow-fall-ps4-patch-1-05-adds-left-handed-support-more/

They seem to be responding to user concerns, but only after complaints come in.

Here's one about a right handed person reporting his use of a mouse with the left hand.  He switched hands due to a repetitive motion injury.

http://techreport.com/blog/25590/adventures-in-left-handed-mousing