I think JA is sending mixed messages about change.

With the Crofts replacing the Elliots at Kellynch, she's seems to value the self-made person over the one who has merely inherited their place. (Similarly when she refers to Mary Musgrove and her preoccupation with her 'place' relative to Mrs. Musgrove.)

On the other hand, I detect a slight tinge of irony in her descriptions of the Cottage Ornee & the changes in the Great House drawing room.

"the compact, tight parsonage, enclosed in its own neat garden, with a vine and a pear-tree trained round its casements; but upon the marriage of the young 'squire, it had received the improvement of a farm-house elevated into a cottage for his residence; and Uppercross Cottage, with its viranda, French windows, and other prettinesses, was quite as likely to catch the traveller's eye"

""old-fashioned square parlour, with a small carpet and shining floor, to which the present daughters of the house were gradually giving the proper air of confusion by a grand piano forte and a harp, flower-stands and little tables placed in every direction. Oh! could the originals of the portraits against the wainscot, could the gentlemen in brown velvet and the ladies in blue satin have seen what was going on, have been conscious of such an overthrow of all order and neatness! The portraits themselves seemed to be staring in astonishment."

Change is not valued for change's sake. And change to mimic the pretensions of the past deserves the same ridicule as those pretensions do in the first place.